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(No Model.) 2 Sheets-Sheet 1..

J. M. BRYAN.

ORE GRUSHER. No. 892,661. Patented Nov. 13, 1888.

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(No Model.) 2 Sheets-Sheet 2.

J. M. BRYAN. ORE GRUSHER.

No. 392,661. Patented Nov. 13, 1888.,

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UNITED STATES PATENT OFFICE.

JOHN M. BRYAN, OF SAN FRANCISCO, CALIFORNIA.

ORE-CRUSHER.

SPECIFICATION forming part of Letters Patent No. 392,661, dated November 13, 1888.

(No model.)

To all whom it may concern.-

Be it known that I, JOHN M. BRYAN, of San Francisco, in the county of San Francisco and State of California, have invented certain new and useful Improvements in Ore-Crushers, of which the following is a specification.

My invention relates to improvements in roller quartz-mills which have upright crushing-rollers and a stationary circular die or crushing-surface with a fiat face in a circular pan or mortar.

The invention relates particularly to the construction and combination of parts hereinafter described, and pointed out in the claim.

The following description explains the nature of my said improvements and the manner in which I produce and combine them in the construction of roller-mills, the accompanying drawings being referred to by figures and letters.

Figure 1 is a cross-section taken vertically through the mortar, the revolving center plate, and the driving pulley or drum of a mill constructed according to my invention. Fig. 2 is a plan of the mortar, with the aunular die, the revolving plate, and crushing rollers in place, the driving-pulley being taken off. Fig. 3 is an inverted plan view ofthe drum.

I generally prefer to cast the mortar with its center cone, surrounding chute, and bedplate in one solid piece; but, for convenience of transportation in the mountains, it can be specially cast in sections. The rim G of the mortar is provided with openings fitted with screens 9, and has an annular channel, G, which runs round the mortar or side of the screens.

I is the bottom plate.

The center cone, H, is cast with the bottom plate and forms a support for the upright post K. This post forms a center for the plate D to turn on. The space between the face of the cone and the surrounding flaring rim of the mortar is the crushing-trough, and the bottom of this space is made flat to receive the annular die h. The die is formed so that a space is left between the edge of the die and the diverging sides of the trough, both on the inner and the outer edge of the die.

The plate D is set to rotate loosely around the fixed center post, and the axles of the crushing-rollers E are fixed solidly in the rollers, but turn freely in journal-boxes d,that are secured upon the top of the revolving plate.

Power is applied directly to the revolving plate D by the drum or large pulley A, at tached by the upright arms or supports C C, that are bolted to the top of the plate and carried upward to support the drum clear of the rollers, as shown more particularly in Fig. 3. In this manner the power is applied directly to the rotating center plate and all gears and counter-shafts are dispensed with.

Scrapers 6, similar to those employed by me in application No. 196,027, are used in this construction.

In the operation of the mill the pulp runs around the mortar next to the screens in a rapid current, while toward the center the movement is much less rapid, and the gold liberated from the matrix by the crushing operation tends to work outward and to settle to the bottom of the trough around the center cone, where it escapes the continuous grinding action of the rollers. Nearly all the gold contained in the ore will be found to be retained in the mortar, and, owing to the simple construction and arrangement of the parts, free access is had to the mortar for cleaning up.

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, is

In a roller quartzniill, the combination of the mortar having a circular die or crushing- JOHN M. BRYAN. [n s] Witnesses:

ALPHoNso B. SMITH, J. H. HOHIENZ.

surface and flaring walls, the outer one of 

